<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>04_执行上下文栈2</title>
	</head>
	<body>
		<!--
			1. 依次输出什么?
			  gb: undefined
			  fb: 1
			  fb: 2
			  fb: 3
			  fe: 3
			  fe: 2
			  fe: 1
			  ge: 1
			2. 整个过程中产生了几个执行上下文?  5
		-->
		<script type="text/javascript">
			console.log('gb: ' + i)
			var i = 1
			foo(1)

			function foo(i) {
				if (i == 4) {
					return
				}
				console.log('fb:' + i)
				foo(i + 1) //递归调用: 在函数内部调用自己
				console.log('fe:' + i)
			}
			console.log('ge: ' + i)
		</script>
	</body>
</html>
